144 Pack - CleverDelights White Prewound Bobbins - Size M Bobbins - Plastic Sided - 1" x 7/16" 144 pack - White prewound bobbins - Style M bobbins - 1" x 7/16" - Approximately 240 yards per bobbin Made with 75D/2 (60 weight) filament polyester thread -- The standard bobbin weight suitiable for nearly all applications These jumbo size M bobbins are typically used with midsize and commercial machines -- Please consult your manual to ensure compatibility See product description below known compatibility list Top-quality CleverDelights brand -- Ships from a USA warehouse by a USA company